METHOD AND APPARATUS FOR DETECTING AND/OR ASSESSING THREE-DIMENSIONAL ELEVATED STRUCTURES ON A SURFACE OF A DOCUMENT

摘要

The invention relates to an apparatus (1) and to a method for detecting three-dimensional elevated structures (2) on a surface (3) of a document (4). The method comprises the steps of: illuminating the surface (3) with light; capturing an image of the surface (3) during the illumination of the surface (3), and evaluating the captured image to ascertain the elevated structures (2), wherein the surface (3) is illuminated areally in at least two different ways and at least one areal image (71, 81) of the surface (3) is captured for each of the different illumination ways and the plurality of areal images (71, 81) of the surface (3) thus captured are evaluated together.